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auroræ - Wiktionary, the free dictionary

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Noun

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auroræ

  1. (rare) Obsolete spelling of aurorae.
    • 1879, John Rand Capron, Auroræ: Their Characters and Spectra, page 3:
      The imagination of the beholders Auroræ are said to have appeared in the shape of armies of horse and foot engaged in battle in the sky...